Flexible tube having a variable stiffness bellows



FIG. 1 is a perspective view of a flexible tube having a variable stiffness bellows showing my new design;

FIG. 2 is a front view thereof, the rear being identical;

FIG. 3 is a side view thereof;

FIG. 4 is another embodiment thereof;

FIG. 5 is a front view thereof, the rear being a mirror image; and,

FIG. 6 is a side view. 

The ornamental design for a flexible tube having a variable stiffness bellows, as shown and described. 